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Original title in Czech: Pokročilé materiályCEITEC VUTAbbreviation: PMAcad. year: 2015/2016
Programme: Advanced Materials and Nanosciences
Length of Study: 4 years
Guarantor
prof. RNDr. Jaroslav Cihlář, CSc.
Issued topics of Doctoral Study Program
The aim of the work are advanced syntheses of multicomponent inorganic (ceramic) nanoparticles in order to modify their bioactive properties. The effect of the particle morphology, phase and chemical composition and macrostructure modification on the bioactive properties will be studied. The bioactivity study by means of interaction with cell cultures is assumed.
Supervisor: Částková Klára, doc. Ing., Ph.D.
Engineering structures contain many singular stress concentrators. The most typical is sharp v-notch. Important set of singular stress concentrators represents material joints or material interfaces (surface layers, composite materials). Many further examples can be found in practice. Common characteristic of mentioned stress concentrators is their stress singularity different from 0.5 (in contrast with a crack). It means that classical approaches of linear elastic fracture mechanics cannot be used. The aim of PhD thesis is to use procedures of generalized linear elastic fracture mechanics for estimation of the moment of initial and a manner of crack propagation from general singular stress concentrator. From point of view of engineering applications the procedures derived will be used e.g. for determination of a manner of layered materials failure (material field), for determination of initial crack propagation from sharp v-notch (in structure design field) or for determination of free surface influence on fatigue crack propagation. Commercial FEM code Ansys and mathematical software Matlab will be used for necessary numerical calculations.
Supervisor: Náhlík Luboš, prof. Ing., Ph.D.
The subject of the PhD study is focused on shaping and consolidation of nanoceramic oxide particles. The main task of the student will contain a study of bulk colloidal ceramics processing using ceramic particles with size below 100 nm via colloidal shaping methods. The research will concern primarily with methods of direct consolidation of ceramic particles. A common difficulty of all these methods lies in the preparation of a stable concentrated suspension of nanoparticles with appropriate viscosity. The solution of the problem assumes understanding and utilization of colloidal chemistry and rheology of ceramic suspensions.
Supervisor: Trunec Martin, prof. Ing., Dr.
The aim of this work is the study of composite catalytic systems based on transition metal oxides in particular, systems with perovskite (brownmillerite or spinel structures) in terms of their synthesis, structure and catalytic activity. Initial work will be to study the synthesis of multicomponent catalytic systems and the study of their surface and surface defects. The main objective will be to study the kinetics and mechanism of redox reactions associated with the synthesis of hydrogen. The dissertation will bring new scientific knowledge about the kinetics and mechanisms of heterogeneous catalysis in multicomponent nanoparticle catalysts that will enable in design of new heterogeneous catalysts for reformation reaction of low hydrocarbons and their derivatives to hydrogen with high efficiency.
Supervisor: Cihlář Jaroslav, prof. RNDr., CSc.
For detailed info please contact the supervisor.
Supervisor: Jančář Josef, prof. RNDr., CSc.
The dissertation will be focused on the study of thermodynamics and kinetics of electrochemical processes taking place in non-aqueous dispersions of inorganic nanoparticles. The work will be mainly focused on the synthesis of inorganic nanoparticles and composites, on the study of electrokinetic behavior of non-aqueous dispersions of nanoparticles and their rheological properties. The dissertation will bring new scientific knowledge about the kinetics and mechanisms of stabilization of inorganic nanoparticles in non-aqueous dispersions in the presence electrosteric stabilizers that will be used in the design of stable inorganic inks for printing and for electrophoretic deposition of ceramic nanoparticles.
New sintering techniques of ceramics materials delivered in recent years new and unexpected results. The methods newly applied for sintering of advanced ceramic materials are connected with rapid heat transfer within very short time. Spark plasma sintering was the first such method followed by flash-sintering, laser sintering, electron beam sintering etc. The aim of the Ph.D. will be study of rapid sintering (densification and grain growth) via the various novel sintering techniques. Understanding of scientific foundations of extremely fast sintering should lead to possible applications. The expected results will stimulate development of energy saving processing, thermodynamically non-equilibrium materials, and also to development of shaping techniques for micro and micro objects.
Supervisor: Salamon David, doc. Ing., Ph.D.
Piezoelectric materials are key components in a wide range of sensor, actuator and transducer devices. The aim of this PhD study is to investigate the introduction of lead-free piezoelectric materials into devices at the micro-scale, using fabrication processes based on photolithography and micro-moulding.
Supervisor: Button Timothy William, prof., Ph.D.
Thesis will be focused to the formation of fibrils in amorphous macromolecular networks. The work is inspired by a self-assembly of fibronectin protein. The formation of fibrils in structure is induced by stretching of material. The protein contains cryptic binding sites, which are structurally simple disulfide bridge (covalent bond). However, they can produce the material with desired thickness, length and spatial distribution of fibrils by the special distribution of the cryptic sites in the molecules. The initial protein is hybrid physical and covalent macromolecular network. The hybrid type of networks was described by model recently. The aim of the dissertation will be to find the theoretical relation between the distribution of physical and covalent sites to the resulting fibrillar structure of material.
Supervisor: Žídek Jan, Mgr., Ph.D.
Dissertation will focus on the study of biological and biochemical interactions of bioceramic materials with bone tissues in order to increase biological compatibility of bone cells with bioceramic surfaces and possibly get the tissue-bioceramic composites with long-lived biological the tissue components. First step will be to prepare and study of bioceramic composites with high biocompatibility and bioactivity containing mechanically resistant ceramic shell and biologically active phosphate component. The second step will be to study the growth of bone cell structures on the surface of bioceramic skeleton in vitro. The dissertation will bring new scientific knowledge about the interaction of bioceramic functionally gradient materials and their surfaces with bioactive bone cell cultures.
The aim of this PhD project is to manufacture and characterise lead-free piezoceramic devices based on BiNaTiO3 and compare the properties and performance with those of standard lead-based materials. A wide range of fabrication and characterisation techniques will be used. The study is part of an international collaboration.
The aim of the study is to delimit a region of mechanical stability of selected crystals under nonhydrostatic triaxial loading. For this purpose, phonon spectra will be computed for the crystals in their ground states as well as in deformed states. Phonon spectra will be obtained using force constants that will be computed by the VASP code.
Supervisor: Černý Miroslav, prof. Mgr., Ph.D.
This work will be focused on modelling of crack growth in NiTi-type materials exhibiting a shape memory effect. Models of processes that underlie the resistance to crack propagation as the slip plasticity, the strain-induced phase transformation and the twinning will comprise an important part of the work.
Supervisor: Šandera Pavel, prof. RNDr., CSc.
FePd, FePt, CoPt, and other magnetic layers became extensively investigated because of their potential application in ultrahigh magnetic recording media. The aim of the study is to delimit a theoretical region of stability for selected crystals of binary alloys. Student will make a model of such crystals under simulated deformations using some of available ab initio codes. In particular, magnetic phase transitions will be studied during the deformation. Results will be compared with available literature data measured on thin films.
Vibration-based energy harvesters utilising piezoelectric ceramics are promising candidates for powering autonomous sensor systems and networks. The aim of this project is to investigate, design and develop processing methods for the manufacture of piezoelectric devices for energy harvesting applications. This will include the optimisation of material properties and characterisation of the new devices. The project will be joint with the Materials for Sensors group.
The work is focused on the development, preparation and characterization of novel scaffolds (cell carriers) for cartilage and bone regeneration. The goal is to design and prepare the composite scaffolds, which imitate the cartilage and bone tissue by chemical composition and hierarchical structure. Important part will be the optimizing biocomposite composition, their chemo-physical analysis, morphology and biodegradation evaluation.
Supervisor: Vojtová Lucy, doc. Ing., Ph.D.
The work will be focused on experimental determination of fatigue strength, crack growth rates and thresholds in NiTi shape memory alloys under push-pull, torsion and combined cyclic loading at room temperature. The multiaxial servo-hydraulic pulsator Industar-M will be utilized in these fatigue experiments. Crack initiation sites and crack-growth paths will be studied in SEM using stereophotogrammetry of fracture surfaces.
Supervisor: Pokluda Jaroslav, prof. RNDr., CSc.
The aim of this project is to elucidate the relationships between processing conditions, structural parameters and piezoelectric properties of Pb(ZrTi)O3-based ceramics for industrial applications. This PhD study will involve close collaboration with an industrial organisation.
Synthesis of “smart” polymer composites via living polymerization technique initiated by nanoparticles is the subject of this work. The goal is new, well-defined polymer composite with predicted molecular weight and narrow polydisperzity index. Chemical and physical properties of prepared “smart” polymer composites suitable for automotive industry application will be evaluated.
The aim of the dissertation is the study of composite reducible transition metal oxides with perovskite or defective spinel structures in terms of stability of phase and chemical composition during repeated redox processes. The work will be focused on the synthesis of oxide nanoparticles and their (cationic and anionic) doping, and the study of their structure. The main part of the work will involve studies of cyclic oxidation and reduction of oxide nanoparticles, the study of surface defects and the mechanism of their formation, locating the active sites for heterogeneous catalysis and testing their activity in model reactions. The dissertation will bring new scientific knowledge about the molecular structure of reducible composite oxides and kinetics and mechanisms of redox processes on their surface.
Newly functionalized polymers suitable for drug delivery will be developed and synthetized. Properties and polymer-drug combination method will be set up in order to control the drug and other bioactive substance release. An essential part will include chemo-physical characterization of prepared polymers together with polymer-drug interaction study and its effect on the sol-gel process.
This work should solve the problem of processing of advanced ceramic materials with optimal microstructure, namely using controlled sintering process. Two approaches are used for the description of sintering and grain growth of advanced ceramic materials – experimental and theoretical. The dissertation work would bridge the gap between sintering theory and experiments with synergic benefits of both approaches for tailoring the ceramic microstructure and properties.
Supervisor: Maca Karel, prof. RNDr., Dr.
Study of selective ceramic nanoparticles linking by photopolymer composition for ceramic prototypes manufacturing on special 3D printer (Lithography based Ceramic Manufacturing). The photochemical processes of photopolymer crosslinking initialised by UV light will be studied. This photochemical reactions leads to selective connections of nanoparticles to patterned ceramic layers or 3D ceramic body. The physical and chemical properties of prepared ceramic layers will be studied.
Supervisor: Veselý Michal, prof. Ing., CSc.